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-   -   How to read toroidal transformer label (https://www.diyaudio.com/forums/power-supplies/353429-read-toroidal-transformer-label.html)

cchean 25th April 2020 03:47 PM

How to read toroidal transformer label
 
Looking at a Holden and Fisher toroidal transformer, the label says "Rating 30". Its a 15-0-15V transformer, not to big and I was wondering whether the 30 means 30VA or 30 amps???

nigelwright7557 25th April 2020 04:04 PM

You can tell by size of transformer.
It would be very big to pass 30 amps at 15 volts.
The rating is probably VA so 1A per winding max current.

cchean 25th April 2020 04:20 PM

Thanks Nigel. I thought the same. Your answer pretty much confirms what I suspected before.

I wonder whether it would be safe to use in circuits requiring more than 15V DC. I mean, after rectifying bridge, capacitors and all, if I build a regulated power supply.

nigelwright7557 25th April 2020 07:59 PM

By the time it is rectified and smoothed it will be around 21 volts.


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